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Sep
8
comment Definition of “localized state”
I suppose there's no "hard", precise definition?
Sep
4
awarded  Popular Question
Aug
26
comment What properties are used to quantify the odds of a star harboring earth-like life?
Without a star, where does the planet get the energy necessary to sustain life? On the Earth, almost all the energy used by higher forms of life originates in photosynthesis, which depends on the sun light.
May
31
comment Google interview riddle and scaling arguments
This question comes from Google? They do this in their interviews to new applicants?
May
30
comment Uniqueness of Helmholtz decomposition?
cross-post: math.stackexchange.com/q/41844/10063
May
30
comment Uniqueness of Helmholtz decomposition?
@Qmechanic the question you link is about existence. This question is about uniqueness.
May
28
comment Why isn't the Earth's core temperature the average of its surface temperatures?
The question says: "the core is hotter than all but a few spots on the surface." Are there spots on the surface of the Earth that are as hot as the core?
May
25
comment Is every quantum measurement reducible to measurements of position and time?
It is interesting that this question has 14 votes, while all 4 answers have 0 votes...
May
13
comment Bell's theorem and why nonlocality is problematic
@RonMaimon Thanks for your reply.
May
11
comment Bell's theorem and why nonlocality is problematic
When you say "... it used to be thought that physics would be too arbitrary," do you mean something like what Einstein says in that paragraph? Are you saying this is 'old fashioned'? If so, can you point me to a good counter-argument?
May
11
comment Bell's theorem and why nonlocality is problematic
That's from "Quantum Mechanics and Reality" ("Quanten-Mechanik und Wirklichkeit", Dialectica 2:320-324, 1948), as cited here (I haven't found an english translation of the full paper)
May
11
comment Bell's theorem and why nonlocality is problematic
"The following idea characterises the relative independence of objects far apart in space, A and B: external influence on A has no direct influence on B; this is known as the Principle of Local Action, which is used consistently only in field theory. If this axiom were to be completely abolished, the idea of the existence of quasienclosed systems, and thereby the postulation of laws which can be checked empirically in the accepted sense, would become impossible." -Einstein
May
11
comment Bell's theorem and why nonlocality is problematic
Ron, are still you listening to this site? You say: "Locality is emphasized, because without locality, it used to be thought that physics would be too arbitrary." I am wondering exactly what you mean here. Recently I found a short paragraph quoted from an Einstein paper:
Apr
30
awarded  Informed
Apr
22
accepted Complete vs General Integral of first order PDE
Apr
21
awarded  Talkative
Apr
20
asked What is Anderson localization? Could someone give an example worked out in detail?
Apr
20
comment Why is information indestructible?
I think he means time evolution is invertible... in other words, +1 @Raskolnikov comment.
Apr
19
revised Mean-field theory and spatial correlations in statistical physics
fixed expectation symbols
Apr
19
suggested suggested edit on Mean-field theory and spatial correlations in statistical physics